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Which of the following are characteristics/properties of permanent hardness in water? (A) Presence of bicarbonates of calcium and magnesium (B) Presence of sulphates of calcium and magnesium (C) Forms good lather when comes in contact with soap (D) Presence of chloride of calcium and magnesium (E) Can be removed by boiling the water Choose the correct answer from the options given below :
Which of the following enzyme is assayed and measured using Spectrophotometer?
Which of the following enzyme is assayed and measured using spectrofluorometric method?
Which of the following enzyme is assayed and measured using radioisotope method?
Ammonium carbonate is assayed by . . . . . . . . for sodium bicarbonate.
When carbon dioxide gas is passed through an aqueous solution of calcium hydroxide, a white precipitate of calcium carbonates is formed, along with water. What inference can be drawn from this chemical reaction? 
1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour?
When 10 g of calcium carbonate is decomposed completely, then 5.6 g of calcium oxide is formed along with the generation of carbon dioxide. Mass of the carbon dioxide formed is: 
What happens when calcium is treated with water? It does not react with water. It reacts violently with water. It reacts less violently with water. Bubbles of hydrogen gas formed stick to the surface of calcium.
1. A student fitted the required apparatus to collect carbondioxide in the gas jars. 2. The student took out some substance from the bottle labelled calcium carbonate and put it in the woulfe's bottle. 3. Then the student poured some from the bottle labelled dilute hydrochloric acid on the calcium carbonate contained in the woulfe's bottle. 4. considering the above mentioned facts maximum how many hypotheses are possible relating to the causes of non-collection of the gas in the gas jar?